High voltage and UHV power grids are the important physical conduction network of long distance and large-scale power transmission in the power system.Transmission lines exposed to the natural environment are often wound by nonmetallic foreign bodies such as plastics,which may easily cause serious power supply safety accidents.Therefore,foreign bodies must be removed.In order to remove foreign bodies on high voltage transmission lines safely and quickly,the principle of laser removal polymer was analyzed and studied in this paper,a laser removal system for foreign bodies on high voltage transmission lines was designed,an experimental device was set up,and seven common foreign bodies on transmission lines were removed experimentally.The experimental results show that the laser cleaning equipment designed in the paper can clean the common foreign bodies of high voltage transmission lines efficiently.It is simple in structure and easy to install and debug and operate.It is easy to achieve remote completely non-contact cleaning.This operation can realize completely lossless for fiber optic cable and it has the advantage of high efficiency,speed and safety.The system takes less than three seconds to clean most of foreign body.